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參數(shù)資料
| 型號： | LNBH221 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | DUAL LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE |
| 中文描述： | 雙LNB電源與控制集成電路升壓轉(zhuǎn)換器和I2C接口 |
| 文件頁數(shù)： | 11/18頁 |
| 文件大?。?/td> | 515K |
| 代理商： | LNBH221 |
LNBH221
11/18
THERMAL DESIGN NOTES
During normal operation, the LNBH221 device dissipates some power. At rated output current of 500mA
on each section output, the voltage drop on both linear regulators lead to a total dissipated power that is
typically 2W. The heat generated requires a suitable heatsink to keep the junction temperature below the
over-temperature protection threshold. Assuming a 45°C temperature inside the Set-Top-Box case, the
total R
thj-amb
has to be less than 40°C/W.
While this can be easily achieved using a through-hole power package that can be attached to a small
heatsink or to the metallic frame of the receiver, a surface mount power package must rely on PCB
solutions whose thermal efficiency is often limited. The simplest solution is to use a large, continuous
copper area of the GND layer to dissipate the heat coming from the IC body.
Given for the PSO-20 package an R
thj-c
equal to 2°C/W, a maximum of 38°C/W are left to the PCB
heatsink. This area can be the inner GND layer of a multi-layer PCB, or, in a dual layer PCB, an unbroken
GND area even on the opposite side where the IC is placed. In figure 4, it is shown a suggested layout for
the PSO-20 package with a dual layer PCB, where the IC exposed pad connected to GND and the square
dissipating area are thermally connected through 32 vias holes, filled by solder. This arrangement, when
L=40mm, achieves an R
thc-a
of about 28°C/W.
Different layouts are possible, too. Basic principles, however, suggest to keep the IC and its ground
exposed pad approximately in the middle of the dissipating area; to provide as many vias as possible; to
design a dissipating area having a shape as square as possible and not interrupted by other copper
traces.
Figure 4 :
PowerSO-36 SUGGESTED PCB HEATSINK LAYOUT
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| LNBH2 | LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE |
| LNBH21 | LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE |
| LNBH21PD | LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE |
| LNBH21PD-TR | LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE |
| LNBK15SP | LNB SUPPLY AND CONTROL VOLTAGE REGULATOR PARALLEL INTERFACE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LNBH221/1TM | 制造商:STMicroelectronics 功能描述:LNB SUPPLY/CONTROL REGULATOR, 36 Pin, Plastic, SSOP |
| LNBH221/1TM-TR | 制造商:STMicroelectronics 功能描述:LNB SUPPLY/CONTROL REGULATOR, 36 Pin, Plastic, SSOP |
| LNBH221_06 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Dual LNB supply and control IC with Step-Up converter and I2C interface |
| LNBH221PD | 功能描述:IC LNB SUPP&CTRL DUAL 36-PWRSOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
| LNBH221PD-TR | 功能描述:其他電源管理 LNB Supply/Control RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel |
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